Rotary cutter head



July 23, 1929. E, STEIN 1,722,022

ROTARY CUTTER HEAD Filed Jan. 26. 1928 Patented July 23, i929.

narra M ELIAS STEIN, OF BOSTON, MASSACHUSETTS.

ROTARY CUTTER HEAD.

Application led January 26, 1928.

This invent-ion pertains to shoe manufacture and more particularly to a rotary cutter head for sole and heel edge trimming machines. In accordance with usual practice the cutter head is of fixed width in an axial direction, and as its blades usually comprise portionsfor trimming the upper and lower corners of the sole, as Well as the outer edge proper, it is necessary to have a separate cutter head for each different thickness of sole. In accordance with the present invention I have provided a cutter head of simple and durable construction which automatically accommodates itself to soles of a wid-e range of thickness, thus avoiding` the expense of keepin on hand a large assortment of cut-ters, as well as the waste of time incident to changing cutters of fixed width or manually adjusting cutters of variable widths. To this end, I provide a main cutter having ylades which are adapted to engage only the outer edge of the sole or, in accordance with a modified arrangement, the outer edge and the upper or rand surface of the sole, tog-ether with an auxiliary cutter adapted to slide axially with reference to the main cutter and having blades shaped to give the desired contour or bevel to the lower corner of the sole. rlChis auxiliary cutter is normally held by a spring in a position such that it is operative to trim the thinnest sole for which the cutter head is designed, but this cutter yields in opposition to the pressure of its spring when a thicker sole is presented to the cutter head, and thus automatically accommodates itself to such thicker sole. `When the main cutter, in accordance with my preferred arrangement, is not provided with blade portions for trimming the rand surface of the sole (which I believe in most instances is wholly unnec-essary), I prefer to provide a guard plate which is movable axially with reference to the main cutter and urge it by means of a. spring vtoward the auxiliary cutter, but, alternatively, and particularly when the main cutter blades are provided with rand trimming portions, I employ a fixed guard or guide plate of usual type adapted to enter between the upper surface of the sole and the adjacent portion of the upper of the shoe.

In the accompanying drawings, Fig. 1 is a side elevation, partly in vertical section, illustrating the preferred form of my invention, in which both the auxiliary cutter and the guard are movable axially with reference to the main cutter;

lil

Serial No. 249,742.

Fig. 2 is a vertical section illustrating a modified arrangement in which the auxiliary cutter is axially movable but in which the guard is iixed with reference tothe main cutter;

Fig. 3 is a diametrical section illustrating a cutter of usual form;

Fig. l is a composite fragmentary front elevation and section illustrating a preferred form of main cutter such as employed in the arrangement shown in Fig. 1;

Fig. 5 is a similar section showing a cutter such as employed in the arrangement of Fig. 2, and f Fig. 6 is a side elevation of the auxiliary cutter.

The numeral 1 designates a portion of the frame of the edge trimming or heel trimming machine and which is provided with the rotat- 75 ing shaft 2 for carrying the cutter head. In Fig. 3 I have illustrated a usual type of cutter comprising the cylindrical body 3 having the blades 4l projecting therefrom, each blade comprising a portion which is substantially straight for trimming the outer edge of the shoe sole, a portion 5 for trimming the rand or upper corner of the sole, and a portion 6 for trimming the lower corner of the sole. In such a cutter the parts 5 and 6 are fixed 85 relatively to each other and thus such a cutter is adapted for trimming soles of but one thickness.

In accordance with my present arrangement I employ a main cutter, such as shown 9o in Figs. 1 and 4, having the cylindrical body portion 7 and the blade 8 which are substantially uniform in width'from end to end.

rThe cutter 7 is mounted on the shaft 2 andV held in position thereon in any desired Ina-nner.V At a point ybetween the cutter 7 kand the frame 1 I mount a sleeve 9 on the shaft. This sleeve is provided with an annular chamber 10 concentric with shaft 2 and which receives a. collar 11 secured tothe shaft 2 by 100 means of a set screw'lQl which projects oait.- wardly into a longitudinally extending slot 13 in the sleeve 9. This set screw thus fixes the collar 1l to the shaft and also compels the sleeve 9 to turn with the shaft, although 105 permitting the sleeve to move axially to a limited extent as determined by the length of the slot 13.

A spring 14 bears at one end against the collar 11 and at its other against the inner 110 end of the auxiliaryfcutter 15 which has screwthreaded engagement with the sleeve 9. This cutter is provided with blades 16 which are disposed in the spaces between the blade 8 of tue main cutter 7, and the blades 16 are provided with cutting edges 17 of the desired contour to give the beveled or other form to the lower corner of the shoe sole. If desired, the main cutter 7 may be loose on the shaft and receive its rotary motion through the engagement of the blades 16 and 8.

In the arrangement shown in l? ig. 1 l eX- tend the shaft 2 beyond the min cutter 7, and on this extended and preferably reduced portion of he shaft 2 lA mount a second sleeve 18 having an annular chamber 19 which receivesa collar20 securedtothe shaft by means of a set-screw 21 whose upper end enters an elongate slot 22 in the sleeve 18. A spring 23 encircling the shaft 2 bears at one end against the collar 20 and at its other against a guard member 24. having screw-tlneaded engagement with the sleeve 18. This guard is of annular form and has a series of circun'iferentially spaced slots separated by the inwardly directed ribs 25 which enter between the blades 8 of the main cutter 7. rlhis guard is provided at its right-hand edge, as indicated in Fig. 1, with a radial i'iange 26 constituting' the guard proper and which is adapted to enter between the upper or rand surface of the sole and the upper of th shoe.

As shown in Fig. 1, the parts are adjusted to receive a shoe sole of minimum thickness between the guard 26 and the cutting enge 17 of the blade 16 of the auxiliary cutter. lf a shoe sole of greater width be applied to the rotating cutter, the auxiliary cutter 15 will be forced to the right by the pressure of the sole thereagainstl and will thus automatically accommodate itself to a sole of any thickness within the range for which the cutter head is designed. By providing the axially movable guard 26, the necessary movement of the cutter 15 to accommodate a wider sole is reduced and the entrance of a very thick sole into engagement with the cutter is facilitated.

Referring to Figs. 2 and 5, l employ the same auxiliary cutter 15 as shown in Fig. 1,

ut in this arrangement I employ a main cutter 28 having the blades 29 which are provided with the rand'trimming portions 30, and I employ a fixed guard 26 secured to the end of the shaft by means of a screw 27.- ln this construction the ent-ire adjustment for diderent thicknesses of sole is taken Mcare of by the movement of the auxiliary cutter 15, and the rand trimming portion of the main cutter is m intained in definite relation to the upper surface of the sole by the action of the guard 26a. i

I claim:

1. A cutter head of the class Vdescribed comprising a main cutter, a guard device having a portion adapted to enter between the upper surface of the shoe sole` and the shoe upper, a sleeve movable axially with respect to the main cutter, the guard device being secured to one end of the sleeve, and a spring within the sleeve normally urging the guarddevice toward the main cutter.

2. A cutter head of the class described comprisinga main cutter having blades for trim-` ming the outer edge of a shoe sole, an auxiliar;Y cutter having blades for trimming the lower corner of a shoe sole, said auxiliary cutter being` movable axially with reference to the main cutter, and a guard device having a partadapted to enter between the upper surface of the shoe sole and the shoe upper, said g `ard device also being movable axially with reference to the main cutter, and spring means normally holding the guard device and thY aux iary cutter at a minimum distance apart but permitting said guard device and auxiliary cutter to separate under the pressure of a shoe sole whereby to accommodate shoe soles of different thicknesses.

Apparatus of the class described com-` prising a rota Ying shaft, a main cutter mounted upon the shaft, said cutter having sgiace-d blades. a sleeve mounted upon the shaft, said sleeve having an annular chamber between it and the shaft, a collar within said chamber, a set screw securing the collar to the shaft, said set screw projecting into an axially elongate slot in the sleeve, a guard device secured to the end of the sleeve, a spring encircling the shaft and bearing at one end againstthe collar and at the other .against the guard device, said guard device comprising a portion having ribs and intermediate slots, the slots being adapted to receive the blades .of the main cutter, said guard device also comprising a radial flange adapted to enter between the upper surface of a shoe sole and the shoeupper.

Signe-d by me at Boston, lvlassachusetts, this 21st day of January, 1928.

. ELIAS STEIN. 

